Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Photovoltaics:

"

The 122 PW of sunlight reaching the Earth's surface is plentiful—almost 10,000 times more than the 13 TW equivalent of average power consumed in 2005 by humans.[1] This abundance leads to the suggestion that it will not be long before solar energy will become the world's primary energy source.[2] Additionally, solar radiation has the highest power density (global mean of 170 W/m2) among renewable energies.[1][citation needed]